git: 8442bd342643 - stable/15 - linuxkpi: Add `kmemdup_array()`

The branch stable/15 has been updated by dumbbell:

URL: https://cgit.FreeBSD.org/src/commit/?id=8442bd342643de2a2da725c9a35ddddb3317b10b

commit 8442bd342643de2a2da725c9a35ddddb3317b10b
Author:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
AuthorDate: 2026-04-12 22:23:06 +0000
Commit:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
CommitDate: 2026-04-29 21:03:48 +0000

    linuxkpi: Add `kmemdup_array()`
    
    It is similar to `kmemdup()` but takes a number of elements to duplicate
    and their size.
    
    The i915 DRM driver started to use it in Linux 6.12.
    
    Reviewed by:    bz
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit 7643dd70a4dfa5fd874300a7161c24b808d6b134)
---
 sys/compat/linuxkpi/common/include/linux/string.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
index 8ca20df27792..ad2b2fe7d377 100644
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -98,6 +98,12 @@ kmemdup(const void *src, size_t len, gfp_t gfp)
 	return (dst);
 }
 
+static inline void *
+kmemdup_array(const void *src, size_t count, size_t element_size, gfp_t gfp)
+{
+	return (kmemdup(src, size_mul(count, element_size), gfp));
+}
+
 /* See slab.h for kvmalloc/kvfree(). */
 static inline void *
 kvmemdup(const void *src, size_t len, gfp_t gfp)